Air Cleaner and Network System

1. An air cleaner comprising: a sensor that outputs a value related to a condition of air drawn into the air cleaner: a communication interface that receives operation information of the air cleaner from a server; one or more non-transitory computer-readable memory having computer-executable instructions embodied thereon; and a processor coupled to the one or more non-transitory computer-readable emory that executes instructions to; upon receiving the operation information from the server, alter a threshold number to be compared with the value based on the operation information: and upon partial or complete termination of communication with the server, initialize the threshold number, or initialize a setting concerning acquisition of the operation information.

2. The air cleaner according to claim 1 , further comprising a controller that accepts an instruction to accept the operation information from the server.

3. An air cleaner comprising: a sensor that outputs a value related to a condition of air drawn into the air cleaner: a communication interface that receives operation information of the air cleaner from a server; a controller that accepts designation of whether to accept the operation information from the server; one or more non-transitory computer-readable memory having computer-executable instructions embodied thereon; and a processor coupled to the one or more non-transitory computer-readable memory that executes an instruction to, initialize a threshold number to be compared with the value upon accepting designation to reject the operation information from the server.

4. The air cleaner according to claim 1 , wherein the processor initializes the operation information at a predetermined time.

5. A network system comprising: a server; and an air cleaner including: a sensor that outputs a value related to a condition of air drawn into the air cleaner; a communication interface that receives operation information of the air cleaner from the server; and a processor coupled to the one or more non-transitory computer-readable memory that executes instructions to: upon receiving the operation information from the server, alter a threshold number to be compared with the value based on the operation information; and upon partial or complete termination of communication with the server, initialize the threshold number, or initialize a setting concerning acquisition of the operation information.

6. The network system according to claim 5 , wherein the server accepts designation of whether to accept the operation information, from the air cleaner and/or an other terminal.

7. A network system comprising: a server; and an air cleaner including: a sensor that outputs a value related to a condition of air drawn into the air cleaner a communication interface that receives operation information of the air cleaner from the server; and a processor coupled to the one or more non-transitory computer-readable memory that initialize a threshold number to be compared with the value on the basis of designation to reject the operation information from the server.

8. The air cleaner according to claim 1 , the sensor is a dust sensor, and the threshold number indicates presence of dust in the air.

9. The air cleaner according to claim 1 , the sensor is an odor sensor, and the threshold number indicates presence of odor in the air.

10. The air cleaner according to claim 2 , the controller further accepts an instruction of transition to an automatic operation, and the processor further executes instructions to: upon accepting instruction of transition to the automatic operation, allow starting the automatic operation provided by the server; and upon partial or complete termination of communication with the server, cancel allowance of the automatic operation.